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Table 4
Model parameters and initial fractional abundances with respect to total hydrogen nuclei.
| Parameter | Model A | Model B | Model C | Model D | |
|---|---|---|---|---|---|
| Tk (K) | Temperature | 9 | |||
| Av (mag) | Visual extinction | 20 mag | |||
| HD | Hydrogen deuteride abundance | 1.60 × 10−5 | |||
| He | Helium abundance | 9.00 × 10−2 | |||
| N | Nitrogen abundance | 6.20 × 10−5 | |||
| O | Oxygen abundance | 2.40 × 10−4 | |||
| C+ | Carbon abundance | 1.70 × 10−4 | |||
| S+ | Sulfur abundance | 1.50 × 10−5 | |||
| Si+ | Silicon abundance | 8.00 × 10−9 | |||
| Fe+ | Iron abundance | 3.00 × 10−9 | |||
| Na+ | Sodium abundance | 2.00 × 10−9 | |||
| Mg+ | Magnesium abundance | 7.00 × 10−9 | |||
| P+ | Phosphorus abundance | 2.00 × 10−10 | |||
| Cl+ | Chlorine abundance | 1.00 × 10−9 | |||
| F | Fluorine abundance | 6.68 × 10−9 | |||
| χUV | UV field strength (Draine units) | 5 | |||
| o-H2/p-H2 | Initial ortho-to-para ratio of H2 | 3 | 3 | 10−3 | 10−3 |
| ζ(H2) (s−1) | Cosmic-ray ionization rate | 1.3 × 10−17 | 1 × 10−16 | 1.3 × 10−17 | 1 × 10−16 |
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